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Management system failures. The U.S. Chemical Safety and
Chapter , Problem 146SE(choose chapter or problem)
Management system failures. The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of industrial accidents (Process Safety Progress, Dec. 2004). The accompanying table gives a breakdown of the root causes of 83 incidents caused by management system failures.
a. Find the relative frequency of the number of incidents for each cause category.
b. Construct a Pareto diagram for the data.
c. From the Pareto diagram, identify the cause categories with the highest (and lowest) relative frequency of incidents.
Questions & Answers
QUESTION:
Management system failures. The U.S. Chemical Safety and Hazard Investigation Board (CSB) is responsible for determining the root cause of industrial accidents (Process Safety Progress, Dec. 2004). The accompanying table gives a breakdown of the root causes of 83 incidents caused by management system failures.
a. Find the relative frequency of the number of incidents for each cause category.
b. Construct a Pareto diagram for the data.
c. From the Pareto diagram, identify the cause categories with the highest (and lowest) relative frequency of incidents.
ANSWER:Solution
Step 1 of 3
a) We have to find the relative frequencies for the given data
The relative frequency can be calculated by the formula
Relative frequency=frequency/Total frequency
Management system cause category |
No.of incidents |
Relative frequency |
Engineering & Design |
27 |
27/83=0.3253 |
Procedures & Practices |
24 |
24/83=0.2892 |
Management & Oversight |
22 |
22/83=0.2651 |
Training & Communication |
10 |
10/83=0.1205 |
Total |
83 |